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  • Open Access

    ARTICLE

    Control on Gradient Adhesive Loading of Porous Laminate: Effects on Multiple Performance of Composites with Bamboo Bundle and Sliver

    Jianchao Deng1,2, Haiying Zhou2, Fuming Chen2, Shuangbao Zhang1,*, Ge Wang2,*

    Journal of Renewable Materials, Vol.9, No.9, pp. 1555-1570, 2021, DOI:10.32604/jrm.2021.015461

    Abstract Elementary units “bamboo bundle” and “bamboo sliver” were processed and cross-linked as “bamboo-bundle veneer (BBV)” and “bamboo-sliver veneer (BSV)” for preparation of laminated composites. The concept of “high-content-adhesive surface treatment” was raised to improve boards’ performance, rather than increasing adhesive absorption of every layer’s porous unit. That is, some BBVs experienced an extra “dipping & drying” to absorb more resin (named “HBBV”). The effect of the amount of knitting threads was also discussed for influencing BBV’s quality. Results indicated that light transmittance of BBVs decreased as the amount of threads added from 3 to 8,… More >

  • Open Access

    ARTICLE

    Bamboo Nail: A Novel Connector for Timber Assemblies

    Yehan Xu, Zhifu Dong, Chong Jia, Zhiqiang Wang*, Xiaoning Lu*

    Journal of Renewable Materials, Vol.9, No.9, pp. 1609-1620, 2021, DOI:10.32604/jrm.2021.015193

    Abstract

    Nail connection is widely used in engineering and construction fields. In this study, bamboo nail was proposed as a novel connector for timber assemblies. Penetration depth of bamboo nail into wood was predicted and tested. The influence of nail parameters (length, radius and ogive radius) on penetration depth were verified. For both tested and predicted results, the penetration depth of bamboo nail increased with the increasing length, radius or ogive radius. In addition, the effect of densification on penetration depth or mechanical properties was evaluated. 1.12 g/cm3 was a critical density when densification was needed, and

    More >

  • Open Access

    ARTICLE

    Characterization of the Flexural Behavior of Bamboo Beams

    Limin Tian1,2, Jianpeng Wei3, Jiping Hao1,*, Qiushuo Wang1

    Journal of Renewable Materials, Vol.9, No.9, pp. 1571-1597, 2021, DOI:10.32604/jrm.2021.015166

    Abstract Bamboo is a renewable and environmentally friendly material often used for construction. This study investigates the flexural behavior of bamboo beams through theoretical and finite element (FE) analyses. Considering the material’s nonlinearity, a method of calculating load-deflection curves is proposed and validated via FE analysis. The interfacial slippage dominated by the shear stiffness of the interface between two bamboo poles significantly influences the flexural behavior of double-pole bamboo beams. Thus, the load-deflection curves for different shear stiffnesses can be obtained via theoretical and FE analyses. Subsequently, a novel configuration using diagonal steel bands to avoid More > Graphic Abstract

    Characterization of the Flexural Behavior of Bamboo Beams

  • Open Access

    ARTICLE

    Study on the Bonding Performance of the Moso Bamboo Dowel Welded to a Poplar Substrate Joint by High-Speed Rotation

    Suxia Li1,2, Haiyang Zhang1,*, Biqing Shu1,3, Liangsong Cheng1, Zehui Ju1, Xiaoning Lu1,*

    Journal of Renewable Materials, Vol.9, No.7, pp. 1225-1237, 2021, DOI:10.32604/jrm.2021.014364

    Abstract The wood friction welding technique with its high bonding strength, low cost, high efficiency, and without any adhesive has been increasing concern in China. Moso bamboo (Phyllostachys pubescens) and poplar (Populus sp.) are widely planted and used in the furniture industry, interior decoration, and wood structure construction in China. The aim of this work was to investigate the bonding performance of moso bamboo dowel rotation welded joints with different dowel/receiving hole diameter ratios. The results indicated that the ratio of dowel/receiving hole diameter was an important parameter that influenced the welding performance. The bonding strength of the… More >

  • Open Access

    ARTICLE

    Nodes Effect on the Bending Performance of Laminated Bamboo Lumber Unit

    Yiwei Xuan1,3, Haitao Li1,*, Zhemin Bei1, Zhenhua Xiong2, Rodolfo Lorenzo4, Ileana Corbi5, Ottavia Corbi5

    Journal of Renewable Materials, Vol.9, No.6, pp. 1143-1156, 2021, DOI:10.32604/jrm.2021.015292

    Abstract This research studied the ultimate bearing capacity of laminated bamboo lumber (LBL) unit and thereby calculated the maximum bending moment. The load-displacement chart for all specimens was obtained. Then the flexural capacity of members with and without bamboo nodes in the middle section was coMPared. The bending experiment phenomenon of LBL unit was concluded. Different failure modes of bending components were analysed and concluded. Finally, the bending behaviour of LBL units is coMPared with other bamboo and timber products. It is shown that the average ultimate load of BS members is 866.1 N, the average… More >

  • Open Access

    ARTICLE

    Dynamic Changes of Chemical and Mechanical Properties of Moso Bamboo (Phyllostachys edulis) Culms under Different Storage Conditions

    Hui Zhan1,2, Zhaohui Niu1, Lixia Yu1, Maobiao Li1, Changming Wang1, Shuguang Wang1,*

    Journal of Renewable Materials, Vol.9, No.5, pp. 1031-1043, 2021, DOI:10.32604/jrm.2021.014109

    Abstract The durability of bamboo based on its chemical and mechanical properties is a crucial consideration for the wood-based industry due to its vulnerability to insects and microorganisms. We investigated the dynamic changes of chemical and mechanical properties of Phyllostachys edulis under air-dry and water storage conditions for 3, 6 and 12 months respectively. The chemical properties of P. edulis bamboo culms varied with culm age but insignificantly with culm height. The mechanical properties of P. edulis culms showed an increasing trend with culm age. Water storage condition decreased the ash, SiO2 and lignin content, but increased the ethanol-benzene extracts. More >

  • Open Access

    ARTICLE

    Fabrication of Crack-Free Flattened Bamboo and Its Macro-/Micro-Morphological and Mechanical Properties

    Zhichao Lou1,2, Tiancheng Yuan1, Qiuyi Wang1, Xinwu Wu1, Shouheng Hu1, Xiaomeng Hao1, Xianmiao Liu3,*, Yanjun Li1,*

    Journal of Renewable Materials, Vol.9, No.5, pp. 959-977, 2021, DOI:10.32604/jrm.2021.014285

    Abstract This work aimed to help the bamboo industry develop methodology for producing imperfection-free bamboo boards that can serve either decorative or structural benefit to consumers seeking to engage with the bioeconomy. Specifi- cally, softened and slotted bamboo tubes were handled by a roller device with nails to render crack-free flattened bamboo board. Softening temperature and time were optimized herein according to findings regarding chemical composition and board mechanical properties. The optimal softening parameters for saturated steam heat treatment is proved to be 160°C for 8 minutes. The flattened bamboo board possesses an increased bending strength… More >

  • Open Access

    ARTICLE

    Bonding Mechanism of Bamboo Particleboards Made by Laccase Treatment

    Jin Wang1, Weigang Zhang2,*, Xiaowei Zhuang1,*

    Journal of Renewable Materials, Vol.9, No.3, pp. 557-568, 2021, DOI:10.32604/jrm.2021.013269

    Abstract Using 1–8 years bamboo as materials, the content of different chemical constituent was tested, and the reactive oxygen species (ROS) free radicals produced from laccase treated bamboo were detected by electron spin-resonance (ESR) spectroscope. The wet-process particleboard was made from laccase-treated bamboo by hot pressing and board mechanical properties including internal bond strength (IB), modulus of rupture (MOR) and thickness swelling (TS) after 2-hours water absorption were tested under different conditions. Results showed that laccase mainly catalyze the bamboo components and improved the bonding strength of laccase-treated boards. By ESR measurement on each single component More >

  • Open Access

    ARTICLE

    Effect of Steam Explosion Technology Main Parameters on Moso Bamboo and Poplar Fiber

    Biqing Shu1,2, Qin Ren1, Lu Hong1, Zhongping Xiao2, Xiaoning Lu1,*, Wenya Wang2, Junbao Yu2,Naiqiang Fu2, Yiming Gu2, Jinjun Zheng2

    Journal of Renewable Materials, Vol.9, No.3, pp. 585-597, 2021, DOI:10.32604/jrm.2021.012932

    Abstract One of the large-scale industrial applications of Moso bamboo and poplar in China is the production of standardized fiberboard. When making fiberboard, a steam blasting pretreatment without the addition of traditional adhesives has become increasingly popular because of its environmental friendliness and wide applicability. In this study, the steam explosion pretreatment of Moso bamboo and poplar was conducted. The steam explosion pressure and holding time were varied to determine the influence of these factors on fiber quality by investigating the morphology of the fiber, the mass ratio of the unexploded specimen at the end face,… More >

  • Open Access

    ARTICLE

    Long-Term Bending Behaviour of Prestressed Glulam Bamboo-Wood Beam Based on Creep Effect

    Nan Guo1,*, Huajing Xiong1, Mingtao Wu1, Hongliang Zuo1, Fengguo Jiang2, Xiaofeng Hou3, Dabo Xin1

    Structural Durability & Health Monitoring, Vol.14, No.3, pp. 229-248, 2020, DOI:10.32604/sdhm.2020.09104

    Abstract Creep is an important characteristic of bamboo and wood materials under long-term loading. This paper aims to study the long-term bending behaviour of prestressed glulam bamboo-wood beam (GBWB). For this, 14 pre-stressed GBWBs were selected and subjected to a long-term loading test for 60 days. Then, a comparative analysis was performed for the effects of pretension values, the number of pre-stressed wires, and long-term load on the stress variation of the steel wire and the long-term deflection of the beam midspan. The test results showed that with the number of prestressed wires increasing, the total… More >

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